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If it were me, I would call Crutchfield at 1-800-319-8264. They don't have a 2010 model listed online but I'd be willing to bet the guys know exactly what you need. Their customer service is excellent.

All of those provide a true double-DIN sized (7x4") opening instead of the factory non-standard size (8" wide). The Metra and Scosche kits have a "frame" that fills the gaps in the factory fascia, plus new plastic mounting brackets. The JDM panel replaces your factory fascia with one that has a smaller opening (and you re-use your car's metal radio mounting brackets).

Tip: Since you still use your OEM brackets with the JDM fascia, you can go ahead with your install and swap out the fascia when you receive the new one (without having to remove your HU again).

Wiring Harness (for power and speaker connections):

Applicable to most* 2008-2012 Impreza/WRX/STI and 2009-2012 Forester

Metra 70-7552

Scosche NN04B

American International NWH-704

Best Kits BHA7552

(all originally intended for newer Nissans, which have a very similar factory radio harness).

If you're planning to retain your audio steering wheel controls (SWCs), none of those harnesses include the SWC wires. See the notes in my pin-out and my homepage for a harness with the SWC wires. Beware: Many of the cheaper ones (and even old Metra stock) may also be missing the ground, illumination, and power antenna wires.

If your Impreza or Forester doesn't have the audio SWCs, it's not too difficult to add them. See links here.

Quote:

* Impreza and Forester models that have one of the various Subaru OEM navigation HU models use different harnesses.

The Kenwood OEM Navi...

still uses the same 14-pin radio power/speaker harness used in earlier years. Models with the Tom-Tom navi also use that harness.

If your car has the OEM Kenwood or Tom-Tom Navi and you want to upgrade to an aftermarket HU, I can put together harnesses to connect to the factory 14- and 24-pin plugs (so you won't have to splice into any factory wires). E-mail me for details (not PM -- see my profile).

Models with the new OEM nav (with the SD-card slot) use completely different harnesses. See this thread.

Antenna adapter:

Many recent Subaru models now have Subaru's proprietary antenna plug. To install an aftermarket HU (nearly all of which have a socket for the older-style Motorola plug), you may need a Subaru antenna adapter.

Metra 40-SB10

Scosche SUAB

American International SU-6

Best Kits BAA26

Note: There is a similar-looking adapter for Nissans (with a gray rectangular plastic shell) which will not work in Subarus! Although at first glance they look the same, the Nissan plug is wider and has different keys.

Important: Do not pull the small coax wires. These connectors are somewhat fragile, and many people have accidentally ripped the wires out of the connectors. Only hold the gray plastic shells. The car's antenna plug has a release button on one of the narrow sides.

Often, you can Google your OEM HU's model number to see a picture of the back (so you can tell which kind of antenna socket it has). Otherwise you'll have to look behind your factory radio to determine whether you need an antenna adapter. Your car may already have an OEM antenna adapter that converts to a Motorola plug.

If you live somewhere cold, heat up the interior of your car before pulling on plastic dash pieces. Remember to open your garage door while you run the engine (or go out to the store and back).

The new Impreza/Forester fascia does have pry slots on the bottom, and can be removed without removing the long "ribbon" trim piece first. People have used plastic dash removal tools, a credit card, a plastic spatula, or even bare hands to gently pry off the panel. If you're overly cautious, apply a few layers of removable masking tape on the surrounding panels. See this post.

Connecting 20-pin harness to Kenwood's harness

The pin-out table for the 20-pin "into car" (AKA "forward") harness is here.

The "EIA Color" column shows the wires on the 20-pin harness. Connect to the harness that comes with your Kenwood. Although the colors should match, use your head unit's manual to verify the function of each wire.

Watch out for wires with stripes -- the stripes are narrow and easy to miss. It helps to work in bright light (daylight, even!).

On my harness (as well as the Nissan harnesses from the other manufacturers), the Blue/White wire at pin 9 powers the Subaru's antenna booster amp. Connect that wire to the Kenwood's Blue "power antenna" wire.

Kenwoods have a plain wire for their SWC input (instead of a 3.5mm jack found on other brands). Connect the SWI module's Blue/Yellow output wire to the Kenwood's Light Blue/Yellow "Steering remote control input" wire. Insulate the end of the SWI's 3.5mm plug.

When you program the SWI and get to the step where it will "learn" your car's steering wheel buttons, crank the engine. Where the instructions say to press an SWC button, keep holding the button firmly for an extra moment after you get the confirmation from the SWI's LED.

Kenwoods have up to 10 remote functions, but your car only has 6 audio buttons. You can assign each of the car's buttons to any one of the HU's functions. For example, you could assign your wheel's Volume Up button to do the HU's "Disc Up" function, if you felt like it.

GPS Antenna

The GPS antenna can be mounted under the dash, above the radio -- the plastic is thin and the signals pass through easily. The factory location is above the instrument cluster.